Bobbin case and tension.



C. L. MILLER & F. B. FREEMAN.

BUBBIN CASE AND TENSION. APPLICATION FILED APR. 28, 1910.

1,157,245. Patented 060.19, 1915.

M WA

= TED srAr s RAT CHARLES LoUIs MILLER, 0 NoRWooD, AND ER'ANKEARR FREEMAN, 0E CINCINNATI,

oEEioE.

OHIO, AssIeNoRs TO UNITED SHOE MACHINERY COMPANY, 0E PATERSON, NEW

JERSEY, A CoRroRA'rIoN' OF NEW JE'RsEY.

I BOBBIN CASE AND TENsIoN.

Application filed April 28, 1910. Serial N0. 558,204.

To all whom it may concern:

Be it known that we, CHARLES LoUIs MILLER and FRANK BARR FREEMAN, citizens of the United States,residing at Norwood and Cincinnati, respectively, in the county of Hamilton and State of Ohio, haveinvented certain new and useful Improvements in Bobbincases and Tensions; and we do hereby declare the following to be a full, clear,

and exact description of the invention, such as will enable others skilled in the art to which it' appertains to make and use the same.

This invention relates to certain new and useful improvements in bobbin cases, and more particularly to the tension devices applied to bobbin cases which are used in the shuttles of lockstitch shoe sewing machines.

One object of the invention is to Provide an improved tension device which may also be utilized to hold the bobbin in its operative position in the bobbin casing.

A furtherobject of the invention is to provide means for varying the amount of the tension upon the thread.

With the above objects in view one feature of the invention comprises means for fricl, tionally retarding the rotation ofythe bobbin, which in consequence produces a tension upon the thread as it is drawn from the bobbin. 7

,s The ipreferred means for retarding the rotation of the bobbin comprise a stationary member supported by the head ofa yieldable bolt, which bolt extends through the centerof the bobbinand has aconstant tendency to move in a direction to force the sta- .tionary member against the surface ofthe bobbin, and owing to the engagement. be-

' the rotation of the latter willbe frictionally tween the stationary member and the bobbin retarded. The preferred means for yieldabiy-suppo'rtingthe bolt comprises a coiled M 'springsurrounding the bolt.

'Means is also provided for normal-ly locking the bolt against rotation relatively to the'bobbin case and in accordance with afurtlier feature ofthe invention the locking 7: means is capable of disengagement upon a slight movement 'of the bolt in a lengthwise direction, enabling thebolt to be rotated to adjust the tension {of the oiled spring and ponseqiiently varythe pressure WithEfwhieh Specification of Letters Patent.-

Patented Oct. 19, 1915.

' represents an enlarged sectional elevation of the bobbin case and bobbin mounted therein, taken upon the line A-A of Fig.1; and Fig. 3 is a detail showing the engagement of the stationary member and supporting bolt.

In the embodiment of the invention illustrated in the drawings, the bobbin case 1 is shown as mounted in one of the well known types of oscillating shuttle 2, which in turn is mounted in a shuttle race 3 as usual. The bobbin case 1 and shuttle 2 are held in proper operative position by the usual bobbin holding arm 4. The above described features and arrangement thereof are all old p and well known in the art, and are only brieflydescribed in consequence thereof.

In order that the bobbin may readily be inserted in operative position, the bobbin case 1 is open at one side. The bobbin 5 is 1 I rotati'vely mounted in the case by being journaled upon a hollow stud 6 which projects inwardly from the inner face of the bobbin case. A .pin or bolt 7 ismounted within the hollow stud 6 and is provided with a head 8 which projects beyond the outer face of the bobbin. The opposite end of the bolt 7 is threaded at 9.

It is preferred to secure a tension upon the-thread, by retarding the rotation of the g bobbin rather than by providing a separate tension device upon the bobbin case, which engages the thread as it leaves the bobbin.

The improved means provided for retarding the rotation of the bobbin, and which at the sametime'hold itin operative position in the bobbin case, comprise 'a fiat disklO adapted to engageone face .of the bobbin.

This disk isprovided with a radial slot 11 extending-from thee periphery to the center of the same, the sides of which are prefer ably adapted to engage a transverse slot,

, or slots, 12 formed in the shank of the: bolt adjacent to'the bolt head 8, by which means the disk is'supported on the bolt and locked against rotation relatively thereto. The 111,

V vention, however, as defined bythe claims is not limited to this form of control but isof sufiicient breadth to include a structure in which the slotsv are formed in the periphery ;of the bolt head 8 and the disk mountedthereon. The disk 10 is pressed against the.

, outer face of the bobbin '5 by yieldingly' 'mounting thebolt 7'in such a manner that there is a constant tendency for the bolt to move in a lengthwise direction andjdraw the head 8 toward the bobbin. The above result 7 thereof and at the other end against a is obtained bymounting a coiled sp ring'l2 about the bolt 7 within the hollow stud 6.? The coiled spring 12 vbears at one end against an inwardly projecting flange 13 formed upon the hollow stud at one end square nut 14: threadedon the bolt 7 and seated in a square hole15 in the closed side of the bobbin case. V

In order that the nut 14 cannot be accidentally displaced, a lock-nut 16 is threaded upon the outer end of the bol': 7 engaging thenutlt. I

' It is convenient under certain conditions to vary the tension on the thread. This result is obtained, in the illustrated form of the invention, by varying the frictional presv in a lengthwise directionwilldisengage the locking means. 45.

sure of the disk 10 upon the 'bobbin 5. R0 tation'of the bolt 7 is, normally prevented by locking it to the hollow stud -6' by means of a key 17 and keyway 18 upon the bolt and inner portion of the stud respectively. It will benoted that the bolt is keyed to the stud adjacent to the outer'end ofthe stud and, therefore, a slightmovement of the bolt The degree of, pressure which the disk 10 exerts upon the "bobbin may be adjusted by varying the tension'of the spring 12. This is accomplishedby first pressing upon the lower end of thebolt and thus moving the same outwardly against the owing to the fact that the nut- '14 is held action of the spring 12 until the locking means are disengaged and then rotating the bolt in either direction which" rotation,

' against rotation in the casing, will cause the bolt to be screwed into the nut and bythus varying the' distance between the nut and the flange 13 the tension of the springg12 is increased or'diminished according to the direction in which thebolt is rotated Machines of this type run at a comparati'vely high speed, and due to the constant .movement of the bobbin case and shuttle V there is a tendency for the disk 10 tobe displaced from its proper position. V'To avoid this the outer' face of the disk is countersunk or. recessed at 19 (seejdotted lines 2),

the head of the bolt 7 being seated this i I tion, it is not to be'understo od that these artisan without :departing from the true scope of the actual invention as defined by theclaims. r 3

WVe claimv 1 1. A shuttle tension device having, fin combination, a bobbin -case open at one side, a bobbin-within' 'the case and having w 1 While. the particulars des cribed areiwell suited to one mechanical form ofgthe, inven-: 79. v

v particulars-are essential since they may be ,,variously modified within the skill of the] a central aperture extending therethrough, a headed bolt withintheaperture, means, normally'tending to move the bolt in a direction to draw the head within the "bobbin,

the bolt and normally tending to move the i 7 bolt in a direction to draw the head within the bobbin, and a member detachably mounted on the head of the bolt and frictionally V engaging the outer surface of the bobbin. 3. shuttletension device having, in combination, a bobbincase open at one side and stud, a bobbin'journaled on said stud,j a

provided with ahollow centrally arranged headed bolt supported. within said studfor yielding longitudinal movement, and a re-' tarding'member arranged to engage beneath her 'i's held inl frictional engagement' with one face of the bobbin. a 7

4:. shuttle tension devicehaving, incomblnation, a bobbln case open at' one side, a

j a bobbin 'rotatably mounted-therein, a' bolt extending through the center of thegbobbin provided with aihead'projecting beyond the outer surface ofithe-same, means normally 7 I tending to movethe bolt in a direction to draw" the head within the bobbin, and athe bo1t head, the outer face-of the plate having aco'untersunk portion to receive the head of the bolt wherein'it is held 'bythe inward movement of the bolt and accidental movement of the plate isavoided. Y e

5, {A shuttle tension device having,in conibination, a bobbin case openat one'side 'hav-.'

ing a centrally arranged hollow stud provided-with an inwardly flanged end, abobbin journaled on-said stud, a-headed bolt within saidistud provided atone end with a squared nut seated Within a squared-open- 'i'ng Within the bobbin caseg-a coiled spring plate adapted to engage the bobbin beneath 105 i the bolt'head whereby the retarding mem- 7 within the stud between said nut and flanged end and surrounding the bolt, and a plate 7 arranged to be seated beneath the head of the bolt and held by said spring in frictional contact with one face of the bobbin.

6. A shuttle tension device having, in combination, a bobbin case open at one side, a hollow stud, a bobbin -journaled upon the said stud within the bobbin case, a bolt extending through the hollow stud provided with a head projecting beyond the outer surface of the bobbin, acoiled spring surrounding the bolt withinthe stud and normally tending to move the bolt in a direc: tion to draw the head within the bobbin, and means for varying the tension of the'spring.

7. A shuttle tension device having, in combination, a bobbin case open at one side, a hollow stud, a bobbin journaled upon the stud, a bolt extending through the hollow stud and provided with a head projecting beyond the outer surface of the bobbin, a

coil'spring surrounding the bolt within the stud and tending to move the bolt in a direction to draw the head within the bobbin,

bination, a bobbin case, a central hollow stud provided with an inwardly projecting flange at its outer'end, a bobbin journaled upon the stud within the bobbin case, a bolt 'mounted within the said stud and provided with a head projecting beyond the outer and hearing at one end against the flanged portion of said stud and at the opposite end 7 against the nut, and a plate engaging the head of the bolt and bearing against the bobbin to frictionally engage thesame, the.

bolt normally locked against rotation relatively to the hollow stud but capable of being disengaged upon lengthwise movement of the bolt against the action of the spring whereby the bolt may be rotated and the tension of the spring changed to vary the friction of the plate upon the bobbin.

9. In a device of the class described, the combination with a casing having an opening in one side to receive a bobbin, a shaft carried by the opposite'side concentric of said opening to receive and carry a bobbin, nieansniounted on said shaft and extending therefrom toward the edge of the opening to retain the bobbin on the shaft, and spring-pressed means carried by said shaft for drawing said meansinward, said shaft being of less length than the bobbin to be used whereby the means for retaining the bobbin on the shaft will bear on the face of the bobbin under the influence of the spring action placing tension on the thread.

CHARLES LOUIS MILLER. FRANK BARR FREEMAN.

Witnesses OLIVER B. KAISER, WM. R. W001).

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.? 

